On average, listings lease in the $20's per square foot per year. The Oak Grove submarket is going through a an increase in rates. In the last 3 months, the median rate went up $23 per sqft per year.
Compared to the rest of the Washington D.C. market, the Oak Grove region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 1 listings have been listed, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 950 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1989 and are Class B.